Narrow fabric needle loom for producing a strip-shaped tissue, and corresponding strip-shaped tissue

ABSTRACT

The invention relates to a narrow fabric needle loom, comprising a shedding device forming a shed, and a weft insertion needle ( 12 ) for at least one weft loop ( 14 ). A knitting needle ( 26 ) is provided on the discharge end ( 20 ) of the shed facing away from the feed end ( 18 ) of the weft insertion needle ( 12 ) and secures the weft loops ( 14 ) by meshing ( 22 ). A second knitting needle ( 36 ) that meshes ( 30 ) the loops is provided on the feed end ( 18 ) of the weft insertion needle ( 12 ). The knitting needles for the feed end ( 18 ) and the discharge end ( 20 ) are mounted so that they can be swiveled about the same rotational axis ( 47 ).

TECHNICAL FIELD

The invention relates to a needle-type ribbon weaving machine forproducing a ribbon fabric according to the preamble of claim 1 and to aribbon fabric of this kind according to the preamble of claim 8.

PRIOR ART

A needle-type ribbon weaving machine and a ribbon fabric produced by itare known from CH-A-598 382. Due to the knitting needle present on theinsertion side and on the discharge side, on the one hand, theneedle-type ribbon weaving machine has a complicated construction and,on the other hand, the ribbon fabric is exposed, during production, tovery high loads which make it possible for the ribbon fabric to bedistorted. The production of the ribbon fabric is made difficult and ispossible only with a low output.

PRESENTATION OF THE INVENTION

The object of the invention is to improve further a needle-type ribbonweaving machine and a ribbon fabric of the type initially mentioned.

The object is achieved, according to the invention, by: the needle-typeribbon weaving machine of claim 1; the ribbon fabric according to claim8.

Since the knitting needles for the insertion side and the discharge sideare pivotable about the same axis of rotation, this results in aconstruction which is simple and, in particular, symmetric on bothribbon sides and which is conducive to a tie-up which is the same onboth ribbon sides, thus preventing the ribbon fabric from beingdistorted.

Since the needle-type ribbon weaving machine has a second knittingneedle for interlacing on the insertion side of the weft insertionneedle, a ribbon fabric can be produced which has an at leastapproximately identical appearance at both edges, that is to say on theinsertion side of the weft insertion needle into the shed and on thedischarge side of the weft insertion needle out of the shed. Thetechnically superfluous interlacing on the insertion side of the weftthread loop into the shed gives the observer the impression that bothribbon edges of the ribbon fabric are identical. This initially leads atleast to a visual improvement in the ribbon fabric. However, theinterlacings at both ribbon edges of the ribbon fabric also results in aribbon fabric construction which is identical or at least very similaron both sides, with the result that the physical properties of theribbon fabric are improved. Thus, for example, a distortion of theribbon fabric, in particular under load, is prevented. The resistivityof the two ribbon edges and consequently their susceptibility to wearare virtually the same. In particular, it was found that by the ribbonedges being interlaced, the adverse properties of the reversal points ofmonofilament weft threads are avoided. The harsh sawtooth-like ribbonedges which are formed by the reversal points of monofilament weftthreads are smoothed out by the interlacing, so that the risks ofmaterial damage and/or personal injury are largely eliminated.

Advantageous refinements of the needle-type ribbon weaving machine aredescribed in the dependent claims 2 to 7 and those of the ribbon fabricare described in the dependent claims 9 to 11.

The interlacing on the insertion side of the shed may be identical to ordifferent from the interlacing on the discharge side. For theinterlacing, there are numerous exemplary embodiments, such as, forexample, the Müller weaving systems I to V described in KIPP, loc. cit.,pages 84–94. The warp, weft and interlacing threads may consist of themost different possible materials and have the most different possibledesigns and dimensions. Particular advantages are afforded by a ribbonfabric having a weft thread consisting of a monofilament thread andinterlacing threads consisting of multifilament threads.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments of the invention are described in more detailbelow with reference to the drawings in which:

FIG. 1 shows the weaving region of a needle-type ribbon weaving machinein a top view;

FIG. 2 shows a detail of the needle-type ribbon weaving machineaccording to FIG. 1 in a side view;

FIG. 3 shows the construction of a first ribbon fabric, in which a weftthread is tied up on both sides by means of an interlacing thread,according to the Müller weaving system II;

FIG. 4 shows the construction of a second ribbon fabric, in which theweft thread is tied up on both sides with itself, according to theMüller weaving system I;

FIG. 5 shows the construction of a third ribbon fabric, in which aninterlacing thread and the weft thread are interlaced on both sides withthemselves, according to the Müller weaving system III;

FIG. 6 shows the construction of a fourth ribbon fabric, in whichinterlacing threads and blocking threads are interlaced with one anotheron both sides, according to the Müller weaving system V;

FIG. 7 shows the construction of a sixth ribbon fabric, in which asecond interlacing thread is introduced together with the weft thread.

WAYS OF IMPLEMENTING THE INVENTION

FIGS. 1 and 2 show the weaving region of a needle-type ribbon weavingmachine in a diagrammatic illustration, only the parts essential for theinvention being illustrated. A shedding device 2 containspattern-controlled heddles 4 which open warp threads 6 according to apattern program to form a shed 8. A weft insertion needle 12oscillatable about an axis 10 inserts a weft thread loop 14 of amultifilament or monofilament weft thread 16 into the shed 8 on aninsertion side 18. The weft insertion needle 12 and consequently theweft thread loop 14 project from the shed 8 on the discharge side 20,said weft thread loop being tied up there by means of an interlacing 22.

In the example of FIGS. 1 to 3, the interlacing is formed by amultifilament interlacing thread 24 which is supplied via a thread guide25 and is drawn through the weft thread loop 14 by means of a firstknitting needle 26 and interlaced with itself by means of a loop 28consisting of the interlacing thread 24. This interlacing system isdescribed as the Müller weaving system II in KIPP, loc. cit., page 86.On the insertion side 18, there is a further interlacing 30 which isformed in a similar way to the interlacing 22 of the discharge side 20.The interlacing 30 is formed by a multifilament interlacing thread 34which is supplied via a thread guide 32 and which is drawn by means of asecond knitting needle 36 through a connection point 38 between adjacentweft thread loops 14 and is interlaced with itself.

The knitting needles 26, 36 are arranged in each case on rockers 40, 42which are fastened to coaxial shafts 44, 46 pivotable about an axis ofrotation 47 and are driven with phase displacement. The phasedisplacement may be 90° to 270°. A phase displacement of 180° preferablycorresponds to the position, offset at 180°, of the weft insertionneedle 12 on the insertion side 18 or the discharge side 20.

The needle-type ribbon weaving machine also contains a weaving reed 48which beats up the weft thread loop 14 inserted into the shed 8 at thebeating-up edge 50 of the ribbon fabric 52. A ribbon guide 54 whichfollows the beating-up edge 50 extends at most over the entire width ofthe ribbon fabric 52 to be produced. The ribbon guide 54 ensures,downstream of the beating-up edge 50, a satisfactory guidance of theribbon fabric 52 produced. This guidance is assisted by stitchknocking-over plates 56, 58 arranged on both sides of the ribbon guide54, that is to say assigned to the insertion side 18 and to thedischarge side 20 respectively. FIG. 4 shows a second ribbon fabric 52a, in which the weft thread 16 a is introduced, as in the example ofFIG. 3, by means of the weft insertion needle 12 into the shed formedfrom the warp threads 6. The weft thread 16 a is looped together withitself both on the discharge side 20 and on the insertion side 18 bymeans of the first knitting needle 26 and the second knitting needle 36respectively. The head parts 60 of the weft thread loops 14 a arecorrespondingly interlaced with themselves during interlacing 22 a onthe discharge side 20. Similarly, the connection points 38 a betweenadjacent weft thread loops 14 a are interlaced with themselves by meansof the second knitting needle 36 on the insertion side 18, as may begathered from FIG. 4 This is the Müller weaving system I in KIPP, loc.cit., page 85.

FIG. 5 shows a third ribbon fabric 52 b, in which the weft thread loop14 b introduced into the shed by means of the weft insertion needle 12is provided on the insertion side 18 and on the discharge side 20 ineach case with interlacings 30 b and 22 b which are formed from theinterlacing threads 34 a, 24 a and the weft thread 16 b which aretherefore interlaced with one another in parallel. This is, here, theMüller weaving system III in KIPP, loc. cit., page 86.

FIG. 6 shows a fourth ribbon fabric 52 c, in which, once again, apreferably monofilament weft thread 16 c in the form of a weft threadloop 14 c is introduced into the shed 8 by means of the weft insertionneedle 12. Both on the insertion side 18 and on the discharge side 20,the interlacing 30 c, 22 c is formed in each case from a multifilamentinterlacing thread 34 b and 24 b which in each case are guided throughthe connection points 38 b of adjacent weft thread loops 14 c or thehead parts 60 of the weft thread loops, these interlacing threads 24 b,34 b being interlaced by means of the first and the second knittingneedle 26, 36, on the one hand, with themselves and, on the other handwith an additional second interlacing thread 62, 64. This is, in thiscase, the Müller weaving system V in KIPP, loc. sit., page 87. Threadguides 66 and thread placers 68 serve for feeding the variousinterlacing threads, so that these can be picked up by the knittingneedles 26 and 36. The thread guides 66 can be driven by heddle framesor heddle carrier rails 78 a, 78 b, 78 c of the shedding device 2 or becontrolled by means of a separate drive.

FIG. 7 shows a fifth ribbon fabric 52 d, in which a weft insertionneedle 12 a not only introduces a weft thread loop 14 d of amonofilament weft thread 16 d, but is also provided with a further eye70, in order to insert a loop 72 of a multifilament interlacing thread34 c into the shed simultaneously and in parallel with the weft threadloop 14 d. This interlacing thread 34 c is interlaced with itself on theinsertion side 18 by means of the second knitting needle 36. For thispurpose, the connection points 74 of adjacent loops 72 of theinterlacing thread 34 c are interlaced with one another outside theconnection point 38 c of adjacent weft thread loops 14 d. Thisinterlacing 30 d therefore lies outside, beyond the connection points 38c of the weft thread loops 14 d on the insertion side 18. On thedischarge side 20, the interlacing 22 d is formed by the interlacingthread 24 c which is simultaneously drawn in each case through the headpart 60 of the weft thread loop 14 d and the head part 76 of the loop 72of the interlacing thread 34 c and is interlaced with itself.

In the exemplary embodiments, the knitting needles are preferably latchneedles, but other knitting needles, such as, in particular, compoundneedles may also be used.

Many other design variants may also be envisaged, in particular theinterlacings on the insertion side do not have to be identical to theinterlacings on the discharge side, but different systems may beemployed on both sides. At the same time, the weft threads may be of themultifilament type, but they are preferably of the monofilament type. Bycontrast, the interlacing threads are, as a rule, multifilament threadswhich by virtue of their flexibility can be adapted more easily to theinterlacing patterns.

LIST OF REFERENCE SYMBOLS

-   2 shedding device-   4 heddle-   6 warp thread-   8 shed-   10 axis-   12 weft insertion needle-   12 a weft insertion needle-   14 weft thread loop-   14 a weft thread loop-   14 b weft thread loop-   14 c weft thread loop-   14 d weft thread loop-   16 weft thread-   16 a weft thread-   16 b weft thread-   16 c weft thread-   16 d weft thread-   18 insertion side-   20 discharge side-   22 interlacing-   22 a interlacing-   22 b interlacing-   22 c interlacing-   22 d interlacing-   24 interlacing thread-   24 a interlacing thread-   24 b interlacing thread-   24 c interlacing thread-   24 d interlacing thread-   25 thread guide-   26 first knitting needle-   28 loop-   30 interlacing-   30 a interlacing-   30 b interlacing-   30 c interlacing-   30 d interlacing-   32 thread guide-   34 interlacing thread-   34 a interlacing thread-   34 b interlacing thread-   34 c interlacing thread-   36 second knitting needle-   38 connection point-   38 a connection point-   38 b connection point-   38 c connection point-   40 rocker-   42 rocker-   44 shaft-   46 shaft-   47 axis of rotation-   48 weaving reed-   50 beating-up edge-   52 ribbon fabric-   52 a ribbon fabric-   52 b ribbon fabric-   52 c ribbon fabric-   52 d ribbon fabric-   54 ribbon guide-   56 stitch knocking-over plate-   58 stitch knocking-over plate-   60 head part-   62 second interlacing thread-   64 second interlacing thread-   66 thread guide-   68 thread placer-   70 eye-   72 loop-   74 connection points-   76 head part-   78 a Heddle frame/heddle carrier rail-   78 b Heddle frame/heddle carrier rail-   78 c Heddle frame/heddle carrier rail

1. A needle-type ribbon weaving machine for producing a ribbon fabric,with a shedding device (2) forming a shed (8) and with a weft insertionneedle (12, 12 a) for at least one weft thread loop (14, 14 a, 14 b, 14c, 14 d) and with a knitting needle (26) for securing the weft threadloop (14, 14 a, 14 b, 14 c, 14 d), said knitting needle being arrangedon the discharge side (20) of the shed (8) facing away from theinsertion side (18) of the weft insertion needle (12, 12 a), a furthersecond knitting needle (36) for interlacing (30, 30 a, 30 b, 30 c, 30 d)being arranged on the insertion side (18) of the weft insertion needle(12, 12 a), whereby the knitting needles for the insertion side (18) andthe discharge side (20) are arranged pivotable about the same axis ofrotation (47), wherein at least one interlacing thread (34 c) can beintroduced as a loon (72) into the shed (8) in parallel with the weftthread loon (14 d), whereby the weft insertion needle (12 a) has afurther guide eye (70) for the interlacing thread (34 c) to be insertedas a loop (72).
 2. A needle-type ribbon weaving machine as claimed inclaim 1, whereby at least one of the threads to be interlaced can beguided by means of a thread guide connected to the shedding device (78a, 78 b, 78 c), preferably to a heddle frame of the shedding device. 3.A needle-type ribbon weaving machine as claimed in claim 1, whereby theknitting needles (26, 36) of the insertion side (18) and of thedischarge side (20) are arranged so as to operate with a phasedisplacement of 90.degree. to 270.degree., preferably of 180.degree. 4.A needle-type ribbon weaving machine as claimed in claim 1, whereby eachknitting needle (26, 36) is assigned a stitch knocking-over plate (56,58).
 5. The needle-type ribbon weaving machine as claimed in 1, wherebyit has a ribbon guide (54) which is assigned to the beating-up edge (50)and which extends at most over the entire width of the ribbon fabric(52, 52 a, 52 b, 52 c, 52 d) to be produced.
 6. The ribbon fabricproduced by a needle-type ribbon weaving machine as claimed in claim 3,said ribbon fabric having weft thread loops (14, 14 a, 14 b, 14 c, 14 d)which are woven into warp threads (6) and which run over the entirewidth of the ribbon fabric (52, 52 a, 52 b, 52 c, 52 d) and are tied upon the insertion side (18) and on the discharge side (20) facing awayfrom the latter by means of interlacing (22, 22 a, 22 b, 22 c, 22 d, 30,30 a, 30 b, 30 c, 30 d) with themselves and/or with at least oneinterlacing thread (34, 34 a, 34 b, 34 c, 64), whereby the weft thread(16, 16 a, 16 b, 16 c, 16 d) is a monofilament thread and the interlacedthreads (24, 24 a, 24 b, 24 c, 34, 34 a, 34 b, 34 c, 62, 64) aremultifilament threads, whereby the interlacing (30, 30 b, 30 c, 30 d) onthe insertion side (18) is formed by an additional interlacing thread(34, 34 a, 34 b, 34 c) between the connection points (38, 38 b, 38 c) ofadjacent weft thread loops (14, 14 b, 14 c, 14 d).
 7. The ribbon fabricas claimed in claim 6, characterized in that it has on the insertionside (18) a further interlacing thread (64) which is interlaced with thefirst interlacing thread (34 b).
 8. The ribbon fabric as claimed in oneof claim 6, whereby an interlacing thread (34 c) is arranged as a loop(72) in the shed (8) in parallel with the weft thread loop (14 d) and isinterlaced on the discharge side (20).